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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6f2adc5aa417f51c8a123f152505402a2384e64abe60969a5f3011f158f41b' 
  AND token = 'e1MVsZ3LzOFQlB41Te084/Q8jSr9DiiY0RJVzhR5tCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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