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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19a1e154cd6c0a020341b4245976f0a9e2d6565bf95b3dffb644b32bdc06f98' 
  AND token = '3rkKGJa7Gcdc7OE2w2tJk4b1Qg7u5Vzy0M616gKSy+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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