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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568d8bf9fbbf89edd2198f785637a64b72cfe3e978266dc0437675700536d113' 
  AND token = 'zWGmTkNpvCH3cp7s1PuYFIe2n1PejcGtNSnCNSXC4PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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