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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2b005dfefefee5960b6844f65738a82d4b88a5de929a1c93d7771695aeebaa' 
  AND token = '99tpufpkFIbl+i+67G1R5KyuhE2A12P6glMbBP1iDRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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