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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dffa5466ba243289c8b3a25a3a64b1a46d5b5681f43318fa2260600352a16b' 
  AND token = 'k2hc76cD+45uq+2Xl1Y9oO2ssKiU4ChhZYZGput7DEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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