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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411d7e8fe4292005955624f2c31d09f82ec91c299626eba3266a84ac488a506a' 
  AND token = 'Llvxu8i+8oodBRWG7bWvbaorCUZE0ytQh4Q5g9WYItE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}