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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd89680dc60be92fb2ef3f4a77c5b0e1da2090a622cdef2b876176a39e4930d' 
  AND token = 'zHu1LRJz3iGB32VR0c9zDzenwz6euVLQFBPKEniUEps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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