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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c3428ea2e8cbcc7df1ef7702a0df1a2fdcccbaa41df282f4fc39757646ca3d' 
  AND token = 'O6i0Ty2vA0henGDsCZDtr5UojEPNOyGXFe9l29bhsYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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