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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7354aa2c571cbaa627dc2df0356530413ac618f2da473a17fe7062bdb41cf589' 
  AND token = 'FcaM6z4AGth/1qoQFad2m2TXE8jKY3FR7TkCwo3Tdy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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