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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b15489af0208b7aacc08c601125f4c63e6f2ffc2aa23c7e3bf5f4f4f40f9607' 
  AND token = 'cx54as5DHa1TSTKyIIlRJDLznykv9yIuEeKndbOvHNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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