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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4593b15388c5d52435cde068f65877d4da047bad6060afeee28be31bef7f873b' 
  AND token = 'EmCfD4h9aAOOu29s3N05KXi/tDE5elJLTLKcX+aQQYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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