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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6792feb8d98f58706e78f59dfff4c61e4c509e96a1208a3e699f949d2d2b0d9b' 
  AND token = 'etq70ujD8l+ju4Rw0iu8FCvG121sCeRBosUvAzVYiPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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