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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537989ab3aad2207487512cddccfacc56140c1a182ec3bcb932f92da2c25f55a' 
  AND token = 'XmmU7AckP7ffvRdhghYGp/j+G+fW6nNDBnagFVdo48I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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