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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d03e82a918259d48285b2ce7a2d166f0d95357c74ac787eba193fd6d0b414b' 
  AND token = 'OB1DgRfn0hV4NnvTxTvV9LWoMG5cBt/dgJ3msJV0cmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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